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Old 28th July 2011, 07:52 AM   #1
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Thumbs down An amplifier without any heating

hello everyone

I always was wondering If I could build an amplifier without any heating and heat sink
can anyone help me with it?????
I want an amplifier that doesn't need any heat sink and works with room temperature and doesn't heat up at all in maximum power

I have a very good amplifier but unfortunately it doesn't have this thing I'm looking for(It heats up)
the power that I'm looking for is around 250W or higher

thank U
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Old 28th July 2011, 08:02 AM   #2
luka is offline luka  Slovenia
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without any heat sink... no
without any heat produced... no

since there is no amp on the world, that is 100% efficient, the is heat generated

Now, that doesn't mean, you can't get amp without heatsink. If we are talking small powers, below say 2w, even better if below 1w, like headphone amp, then yes you can have amp without heatsink, since IC or components themself (pcb is to some point heatsink too) can dissapate some heat. They can get hot, but not that much that it would hurt them.

If you are taking about power levels in hifi amps or in several kw range, then there is no amp that won't have heatsink
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Old 28th July 2011, 08:02 AM   #3
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Such amplifier doesent exist!!

All amplifier class d included will get warm/hot, forced air cooling with fans is the only way to keep an amp from reaching much above ambient, this still requires a quite beefy heatsink though.

But even if you keep the heatsink cool, the transistors may still be at 50-100deg C inside due to thermal resistance.
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Old 28th July 2011, 08:14 AM   #4
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Is it possible to build an amp that doesn't produce heat? Yes, all amps don't produce heat until you plug them in.

Heat is the by-product of work. So a working amp will always produce heat, always. The efficiency tells you how much heat is produced for an amount of work. And since perpetual motion machines aren't exactly common place these days efficiency will always be lower than 100%, so it's physically impossible to build a working amp that doesn't produce heat.
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Old 28th July 2011, 08:23 AM   #5
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Quote:
Originally Posted by luka View Post
If you are taking about power levels in hifi amps or in several kw range, then there is no amp that won't have heatsink
Except for valve amps which don't require heatsinks at all, they sure produce the heat though.
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Old 28th July 2011, 08:50 AM   #6
luka is offline luka  Slovenia
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Quote:
Originally Posted by goosewing View Post
Except for valve amps which don't require heatsinks at all, they sure produce the heat though.
True! and this would be probably the only kinda amp (that I know of) that would do this, BUT
Quote:
doesn't heat up at all in maximum power
As this being the requirement, valve amps are out
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Old 28th July 2011, 08:59 AM   #7
poynton is offline poynton  United Kingdom
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If the amplifiers metal case does not count as a heatsink and there are sufficient power devices with TO3 case mounted on it and the output power is not excessive for normal sound levels ....

Maybe possible.?


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Old 28th July 2011, 09:01 AM   #8
luka is offline luka  Slovenia
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metal case seems very logical way of thinking it
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Old 28th July 2011, 09:13 AM   #9
poynton is offline poynton  United Kingdom
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There are many good looking metal cases where the heatsink is not obvious.
They can also be fitted "internally" so as not to be obvious .

Basically, use a large metal mass as a heatsink.

Is the reason for "no heatsink", to minimise the heat produced or cosmetic reasons?



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Last edited by poynton; 28th July 2011 at 09:15 AM.
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Old 28th July 2011, 10:26 AM   #10
AP2 is offline AP2  Italy
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Hi,
Just for curiosity. the argument is interesting, considering that this is a special case.
yes, there to SDA-300 up to 300w (4R) without heatsink, just a profile (60x27mm) to mount the mosfets. you can see on audiopower -> shop.
loses only the final stage 700mV from supply rails, the clips very clean.
Just to see him, it is out of production, then it is offered with a big discount.
obvious that the assistance will be provided.

Regards
Roberto P.
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